Indexing storefronts

This is about indexing the storefronts of the Apple Retail Stores around the world. *** Don't miss to check the fullsize preview attachment.

Work in progress, but almost there. I'll try to add some more realistic shadows and few colors to differentiate the used materials, but still wondering which kind of information I can add to this poster to provide some interesting insights or unexpected relations (besides title and city, or how many times the storefront is used on different places).
What are you interested in, guys?

Any comments and suggestions are welcome and highly appreciated. Thanks!